() => {
    const obj = {
        name: "张三",
        age: 20,
        doThing(a) {
            return 123;
        },
    };
    const obj2 = {
        name: "张三",
        age: 20,
        doThing(a) {
            return 123;
        },
        height: 180,
        weight: 130,
    };
    const obj3 = {
        name: "张三",
        age: 20
    };
    const obj4 = {
        height: 180,
        weight: 130
    };
    const obj5 = {
        name: "张三",
        age: 20,
        height: 180,
        weight: 130
    };
};
